71773987 has 2 divisors, whose sum is σ = 71773988. Its totient is φ = 71773986.

The previous prime is 71773973. The next prime is 71774023. The reversal of 71773987 is 78937717.

It is a weak prime.

It is an emirp because it is prime and its reverse (78937717) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71773987 - 2⁷ = 71773859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71773987.

It is not a weakly prime, because it can be changed into another prime (71773937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35886993 + 35886994.

It is an arithmetic number, because the mean of its divisors is an integer number (35886994).

Almost surely, 2^71773987 is an apocalyptic number.

71773987 is a deficient number, since it is larger than the sum of its proper divisors (1).

71773987 is an equidigital number, since it uses as much as digits as its factorization.

71773987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518616, while the sum is 49.

The square root of 71773987 is about 8471.9529625701. The cubic root of 71773987 is about 415.5810064954.

The spelling of 71773987 in words is "seventy-one million, seven hundred seventy-three thousand, nine hundred eighty-seven".